Rotterdam boss Richard Krajicek said the entries of weekend title-winners Alexander Zverev and Grigor Dimitrov would soften the box office blow after Rafael Nadal and Stan Wawrinka withdrew due to injury.

The tournament was left to feature former US Open winner Marin Cilic as top seed, with the 2014 Rotterdam finalist starting his current campaign against quirky Frenchman Benoit Paire on Tuesday.

The seventh-ranked Cilic aims to escape a run of bad luck which handed him second-round defeats at his last three events in Chennai, the Australian Open and Montpellier.

Krajicek, the 1996 Wimbledon winner, said that the presence of highly-rated German teenager Zverev and Bulgarian Dimitrov, who is 14-1 this season, was a stroke of fortune for his audience.

Both of the young guns claimed titles at the weekend, with Zverev winning in Montpellier over Richard Gasquet while Dimitrov beat Belgian David Goffin at home in Sofia.

"Zverev's here. Dimitrov is here and they both won titles," Krajicek told local media. "There are a lot of good players, highly ranked, in our field. We are all assuming Zverev (now into the top 20) will soon be in the top 10."

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